Protective device for slays driven with resilient crank arms



Aug. 12, 1969 J. PICANOL VICE FOR SLAYS DRIVEN WITH RESILIEN'I' CRANK ARMS PRO'IIjJC'I'lVE DE Filed March 7, 1968 2 Sheets-Sheet l INVENTOR. J. P L c an o! ic/KM QT ATTOR HESS Aug. 12, 1969 Filed March 7, 1968 J. PICANOL PROTECTIVE DEVICE FOR SLAYS DRIVEN WITH RESILIEN'I CRANK ARMS 2 Sheets-Sheet 2 INVENTOR.

United States Patent Int. (:1. D03d 49/60, 51/42 US. Cl. 139-188 5 Claims ABSTRACT OF THE DISCLOSURE Safety device for the slay with resilient crank arms in looms comprising a rigid crank arm located between the linked end or ends of the slay and the corresponding end or ends of the said crank-shaft.

This invention relates to the safety of the slay with resilient crank arms in looms and more particularly to the protection of the said slay against any detrimental stress from the sudden stop of the loom by the contact between the buffers integral with the slay and the stops integral with the loom frame.

It is well known that when suddenly stopping the slay, the ends of the latter are strongly stressed by an inertia effect tending to induce distorsions and possibly local damages. In addition, these inertia effects develop interfering stresses producing shocks and detrimental jarrings. In fact, at the time of a stop, the resilient crank arms subjected to an axial compression stress, are also subjected to a slight reduction of length, whereas the length of the ending rigid crank arm or crank arms remains constant. Thus, it was found that the slays with resilient crank arms set a very particular problem. When no precaution is taken, the slays are subjected to a very detrimental distorsion at every stop.

This drawback is still increased in that the said ending portions of the slay which are so dangerously stressed and distorted, correspond to the single or several shuttle boxes.

It is an object of the present invention to provide a safety device for controlling the slay with the view of preventing the said detrimental stresses of the ending portions of the slay without affecting the good working of its instantaneous dwell device.

Another object of the present invention is also to provide this safety device without any complication and without introducing any delicate part.

Finally, another object of the present invention is to provide a mechanical combination which is both strong and greatly flexible.

This safety device is essentially characterized in that it comprises a mechanical combination of the proper slay at least one end of which is linked, the conventional crank-shaft, at least two resilient crank arms between the said slay and the said crank-shaft and a rigid crank arm located between the said linked end or ends of the slay and the corresponding end or ends of the said crank-shaft.

When both ends of the slay are linked, two rigid crank arms will be used, namely one at each of the said ends of the crank-shaft.

The different constituting elements of this combination forming the safety device are essentially varying in accordance with the intended loom construction.

The elements of the combination may be elements known 3,460,586 Patented Aug. 12,1969

per se, the invention resulting from the grouping of these different elements for reaching the previously mentioned purposes. p v

Accordingly, the examples described hereafter have no limitative character and they refer to the enclosed drawings in which:

FIGURE 1 shows as diagrammatically as possible the safety device according to the invention;

FIGURE 2 shows diagrammatically another embodiment of FIGURE 1;

FIGURE 3 shows a perspective view of a loom portion representing the constituting elements of the safety device of the invention in the example of FIGURE 2;

FIGURES 4 and 5 show, on an enlarged scale and in two characteristic positions, the portion indicated at F4 in FIGURE 2, completed by stops and buffers.

FIGURE 1 shows diagrammatically the most simple characteristic combination forming the safety device according to the invention. This combination comprises the slay 1, at least one end portion 2, which includes the shuttle box at that end, being pivotally linked to the central slay portion at 3, the crank-shaft 4, the resilient crank arms 5-6 connecting the said slay 1 to the said crank-shaft 4 and a rigid crank arm 7 connecting the crank-shaft 4 to the said linked end 3 of the slay.

FIGURE 2 shows exactly the same elements, wherein the slay 1 has two linked end portions 2'- respectively or 3'-3" at the corresponding ends of the slay 1.

The adjoining faces 8-9 or 8-9 are slightly diverging to leave therebetween an angular space a the value of which may be, e.g. about 5.

FIGURE 3 shows also diagrammatically the buffers and stops 10-11 and 10'-11 respectively, which may be made as known.

With this device, it results that, when the slay 1 is suddenly brought to a standstill by the engagement of buffers 10-10' into stops 11-11 respectively, a slight compression is exerted in the resilient crank arms 5-6, whereas the rigid crank arm or crank arms 7-7 respectively are positively actuating the corresponding end portions 2-2 of the slay. Consequently, the said end portions are angularly shifted about their linking axis 3-3 respectively. In this way, while preserving all the flexibility required for the operation of the slay, more particularly in the case of an instantaneous dwell, the end portions of the slay which carry the shuttle boxes are not subjected to any detrimental stress and the constituting portions of the slay 1-22' respectively return automatically into alignment when normally starting again the loom.

It is apparent that these different elements of this characteristic combination may be replaced by any equivalent element or an element having an equivalent function, the represented means being given only by way of a non limitative example.

What I claim is:

1. In a loom, a protective device for slays operating with resilient crank arms comprising a slay having a central portion and two end portions at least one end portion is pivotally secured to said central slay portion, a crankshaft, at least two resilient crank arms between said central slay portion and said crank-shaft and a rigid crank arm between the said linked end portion and the corresponding end of the said crank-shaft.

2. A device according to claim 1, characterized in that, both end portions of the slay are linked and a rigid crank arm is provided between the crank-shaft and each end portion of the slay.

ing so that an angular slot is provided, which determines limits of relative angular shiftings of said end portions and said central portion of the slay under the effect stress dilferences, due to sudden stops of said slay.

4. A device according to claim 3, characterized in that the angular space forms an angle of between 3 to 8".

F 'Sf'A' device according to claim 1, characterized in that said end portions of the slay support shuttle boxes.

UNITE-ESTATES PATENT-S 12/1938 Turner 139190 6/1939 Kronoff 139-188 6/1941 Shimwell et al. 139-190 7/1955 Goqdgame 139-188 I a User. X.R. 

